Ottawa
August
Weather in Ottawa for August 2026
Your guide to Ottawa weather in August - trends and predictions
In general, the average temperature in Ottawa at the beginning of August is 25.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22 °C by the end of August.
Ottawa in August brings notable rainfall, with an average of 18 rainy days and a total precipitation of 139.9 mm.
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Temperatures
Rain 🌧️
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13
Dry days
18
Rainy days
0
Snow days
23°/13°
Temperatures
14 km/h
Avg max wind
77 %
Avg humidity
Ottawa Weather August
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Temperatures trend during August in Ottawa
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August weather in Ottawa day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. |  Patchy rain possible | 24° /14° | 0.4 mm | 6 | |
| 2 Aug. |  Overcast | 28° /14° | 0 mm | 6 | |
| 3 Aug. |  Moderate or heavy rain shower | 28° /17° | 12.6 mm | 7 | |
| 4 Aug. | Patchy rain possible | 28° /17° | 1.4 mm | 6 | |
| 5 Aug. | Overcast | 24° /14° | 2.2 mm | 5 | |
| 6 Aug. |  Sunny | 26° /13° | 0 mm | 6 | |
| 7 Aug. |  Partly cloudy | 23° /15° | 5.3 mm | 6 | |
| 8 Aug. | Moderate or heavy rain shower | 24° /15° | 14.4 mm | 6 | |
| 9 Aug. | Patchy rain possible | 27° /17° | 6.9 mm | 6 | |
| 10 Aug. | Moderate or heavy rain shower | 27° /16° | 8 mm | 6 | |
| 11 Aug. | Patchy rain possible | 26° /15° | 2.8 mm | 6 | |
| 12 Aug. | Moderate or heavy rain shower | 26° /15° | 7.8 mm | 6 | |
| 13 Aug. | Patchy rain possible | 26° /16° | 7.3 mm | 5 | |
| 14 Aug. | Patchy rain possible | 26° /16° | 0.7 mm | 6 | |
| 15 Aug. | Patchy rain possible | 26° /15° | 0.2 mm | 6 | |
| 16 Aug. | Patchy rain possible | 29° /16° | 0.3 mm | 7 | |
| 17 Aug. | Light rain shower | 24° /16° | 6.8 mm | 6 | |
| 18 Aug. | Moderate or heavy rain shower | 22° /14° | 12.2 mm | 5 | |
| 19 Aug. | Overcast | 19° /12° | 2.7 mm | 4 | |
| 20 Aug. |  Cloudy | 20° /12° | 4.6 mm | 4 | |
| 21 Aug. | Patchy rain possible | 23° /12° | 0.6 mm | 5 | |
| 22 Aug. | Patchy rain possible | 23° /13° | 0.3 mm | 5 | |
| 23 Aug. | Patchy rain possible | 25° /14° | 0.1 mm | 6 | |
| 24 Aug. | Patchy rain possible | 25° /15° | 0.9 mm | 5 | |
| 25 Aug. |  Fog | 23° /14° | 1.6 mm | 5 | |
| 26 Aug. | Light rain shower | 22° /14° | 4.3 mm | 5 | |
| 27 Aug. | Cloudy | 24° /12° | 0.1 mm | 6 | |
| 28 Aug. | Mist | 21° /12° | 14.8 mm | 5 | |
| 29 Aug. | Patchy rain possible | 21° /9° | 2.4 mm | 5 | |
| 30 Aug. | Overcast | 20° /10° | 0.5 mm | 5 | |
| 31 Aug. | Partly cloudy | 23° /11° | 1.3 mm | 6 | |
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Important Notice
Our weather forecast for Ottawa in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Ottawa forecast closer to your planned date for the most up-to-date weather information.
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Ottawa in August - FAQ
What are the expected maximum and minimum temperatures in Ottawa during August?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Ottawa during August?
Significant rainfall exceeding 139.9 mm is expected in Ottawa during August, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ottawa during August?
The average wind speed in Ottawa during August is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Ottawa
Explore the daily rainfall trends and prepare for Ottawas August weather 💧
UV exposure in Ottawa during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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